Adele thinks modesty is key to her success.

She said: "I don't think stage fright is important, but I think it's really important that you don't think you're great. Because once you get to that point, you just f*** everything up.

"You think that everyone's going to think you're great all the time, and that's rubbish.

"Artists and bands that I've grown up loving, they get a certain amount of success and they're like, 'Oh, this is easy.' And I'm like, 'I don't like you anymore. I like your music, but I don't like you.'

"And if you don't like the person, why are you going to let them into your life? It's a whole package, which is what I think an artist should be."

Adele also admitted she's motivated by a desire to not let her fans down.

She told NPR: "With my stage fright, I just don't want to let people down. I get so nervous onstage that I don't have the guts to improvise or anything like that.

"But also, you know when you go to a show of someone that you love, and they play a record that you absolutely love, but they play it so many different ways that you can't even sing along?

"One of my favorite things about going to a gig and, doing a gig, is the singalongs - the crowd gets to sing with you and you get to sing with the artist. Like, that's one of my favorite things personally.

"So I would never want to perform a song completely differently. I mean, imagine if I started doing a bashment version of 'Hello' everyone would be like, 'What?'"